CI: build crates independently on Windows MSVC and MinGW

[conradoplg]

Motivation

We disabled Windows build in #3799 due to zcash_script requiring MinGW, and rocksdb requiring rocksdb.

But we could build and test crates independently, with different targets. With that, we at least would have some testing on Windows

Specifications

Designs

• Re-enable Windows build

• Change CI to build and test (on Windows):

• zebra_script with MinGW

• zebra_state with MSVC

• Any crates that import only one of these two with the matching compiler

• Any crates that import neither with both

• Skip any crates that import both

Related Work

[ftm1000]

Hey team! Please add your planning poker estimate with ZenHub @gustavovalverde @conradoplg @dconnolly @teor2345

[teor2345]

We'll probably just fix the Windows build.